My husband found this channel recently and we've been quickly going through their backlist. The videos, by Mike Neumann, go into a lot of depth, so it's best if you've seen what he's talking about both because of the spoilers and because analysis is always better when you know the media. He does a lot of older films, making me want to rewatch stuff I haven't seen in years. I don't always agree with his criticism (personally I enjoyed the Ladyhawke soundtrack, though I know he's not alone in panning it), but on the whole he's got some great insights.
Here's his analysis of Cabin in the Woods to get you started.